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观察头低位一３０°尾部悬吊１３周对大鼠左室乳头肌等长收缩性能的影响。结果表明，１３周尾部悬吊大鼠左室乳头肌的静息张力与发展张力较同步对照组分别下降１６％和３３％（Ｐ＜０；０５和Ｐ＜０．０１）；最大张力发展速率与最大张力下降速率分别下降３３％和２８％。当细胞外钙离子浓度分别为０．２５、０．５、１．５、２．５、３．５、４．５．５与６．５ｍｍｏｌＬ时，其发展张力较同步对照均有３１％至３８％的降低。这些变化提示：１３周尾部悬吊使大鼠心肌等长收缩性能明显降低。
To observe the effects of head-tail 30-degree tail suspension for 13 weeks on the isometric contraction of left ventricular papillary muscles in rats. The results showed that resting tension and developing tension of left ventricular papillary muscle in tail suspension rats decreased by 16% and 33% (P <0; 05 and P <0.01) And the maximum rate of tension decreased by 33% and 28% respectively. When the extracellular calcium concentration were 0.25,0.5,1.5,2.5,3.5,4.5.5 and 6.5mmolL, the development of tension than the synchronous control were 31% to 38% decrease. These changes suggest that the 13-week tail suspension significantly reduces the isometric contraction of rat myocardium.